After splitting out the Center and Rear channels on SW's Penteo (or whatever it is) up-mix, I wasn't too impressed. If you listen to the rears isolated they sound fairly muddied-up to me; seems he could have done better given he has access to real source material. The center sounds like quite a bit of what's in the Fronts mixed together, more like what a typical 5.1 Penteo mix sounds like, to me anyway. Maybe he just didn't want to spend the time (or they the money) for him to dig deeper into the up-mix; however doesn't appear too many here even notice such things, also, as taken as a whole, it doesn't sound that bad. I'd love to hear Wilson's thoughts and work flow on that up-mix! Wouldn't mind others here to check this out and report back on their findings.